Boring-mill for locomotive-tires, &amp;c.



No. 727,413. PATENTED MAY 5, 1903..

I. E. MQGRAGKEN.

BORING MILL FOR LOGOMOTIVE TIRES, &0.

APPLICATION FILED JAN. 11, 1902.

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mnurlmi luml No. 727,413. PATENTED MAY 5, 1903.,

I. E. MOORAOKEN. BORING MILL FOR LOOOMOTIVE TIRES, m.

APP LIOATION FILED-JAN. 11. 1902.

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umumumnummunfi IIIIIHIHH UNirhD STATES Patented May 5, 1903.

. PATENT 'FFICE.

ISAAC E. MCCRAOKEN, OF CHICAGO, ILLINOIS.

SPECIFIGATIONformingpart of Letters Patent N 0. 727,413, dated May 5, 1903.

Application filed January 11,1902. Serial No. 89.280. (No model.)

To all whom it may concern:

Be it known that I, ISAAC E. MOCRACKEN, a citizen of the UnitedStates of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Boring- Mills for Locomotive-Tires and the Like, of which the following is a specification.

This invention relates to a mill or machine for boring out the steel tires of locomotivedrivers and other like railway-car wheels in which the rim is made separate from the body of the wheel and subsequently attached thereto; and the objects of the present improvement are to provide a simple, durable, and convenient construction and arrangement of parts with. which'such boring operation can be performed in an accurate, speedy, and economical manner, all as will hereinafter more fully appear, and be more particularly pointed out in the claims.

In the accompanying drawings, illustrative of the present invention, Figure 1 is a general side elevation of a boring-mill embodying the present improvements; Fig. 2, a general plan view of the same; Fig. 3, an enlarged transverse section at line a; 41;, Figs. 1 and 2; Fig. 4, a fragmentary longitudinal section at line a2 m, Fig. 3, illustrating the fixed headstock of the present construction in section, and the revoluble work holder and its immediate connectionsin elevation; Fig. 5, an enlarged detail section at line 332 m Fig. 3, illustrating the radially-adjustable holding-jaws of the work -holder; Fig. 6, a fragmentary face view of the scroll-ring by which the radial holding-jaws are engaged and simultaneously operated.

Similar numerals of reference indicate like parts in the several views.

Referring to the drawings, 1 represents the main bed or supporting-frame of a mill embodying my invention, and 2 the head-stock fixedly secured thereto in a transverse position to the length of said bed, and preferably in a central position with relation to both the width'and length of the bed, as illustrated in Figs. 1 and 2.

The head-stock 2 will comprise an attaching-base 3 for rigidly securing the head-stock in place upon the main bed 1, and a vertical ring-shaped bracket portion 4, the circulariuterior of which constitutes an annular bearing in which an annular or ring-shaped workholder 7 is adapted to turn. The annular work-holder is arranged within an annular recess in the bracket portion of the head-stock and held in place by means of annular inwardly-extending holding-lips 5 'at either side of such recess. In order to permit of a ready introduction of the WOl'k-llOldBI into place in the assemblage of the parts, as well as a subsequent removal thereof for repair and the like, the said ring-shaped bracket portion of the head-stock will in my preferred construction, as illustrated in Fig. 3, be formed of two semicircular sections provided with flanges 6 at their meeting ends to afford means wherebythey may be securely bolted together in an assemblage ofthe parts.

The annular work-holder is provided on its peripherywith 'a toothed gear formation 8, by means of which the work-holder is adapted to, receive positive rotation from the drivingshaft of the mill. Said gear formation 8 projects into'a groove formed in the head-stock to receive the same, said head-stock having at the sides of said recess two annular cylindric inwardly-facing bearing-surfaces, which, with the inner faces of the lips 5, afford bearings in which the work-holder is held and adapted to freely turn.

9 is'the driving-shaft, journaled in the base 1 and carrying a driving-pinion 10, which meshes with the gear formation 8 of the annular work-holder 7 to impart positive rotation thereto. It is within the scope of this part ofthe present invention to employ any other well-known equivalent mechanism for imparting a positive rotation to the workhold'er5-such, for instance, as the well-known worm' and worm-Wheelmechanism generally employed in the present art. i

11 is a spur gear-wheel secured to one end of the driving-shaft, and 12 is a pinion meshing therewith and carried by the power-shaft 13, having the usual cone driving-pulley14, by which a change'of speed of themechanism is attained as usual in the present class of metal-working machines.

15 represents a series of radially-moving jaws sliding in suitable guide-recesses in the annular work-holder 7 and connected together to move in unison in a radial direction to and from the axis of such annular work-holder by means of an annular scroll or cam-ring 16, having a flat inner face, in which is formed a rib or thread of scroll or spiral form, said thread being continuous and making several turns about the canrring. Said spiral rib or thread engages recesses formed in the adjacent edges of the radially-movable jaws 15. Said jaws have parallel side edges extending to the inner or holding ends thereof, so that said jaws may be drawn into the recesses in the work-holder until their gripping ends are flush, or nearly so, with the inner face of the work-holder; This construction enables the jaws to have a wide range of movement, while at the same time requiring that the inner diameter of the work-holder should be only slightly greater than the outer diameter of the largest wheel or article that the mill is adapted to operate upon.

With the employment of the present invention for boring out the inner surface of locomotive-tires or other railroad-wheels the engaging faces of the series of holding-jaws 15 will be formed to fit-the outer contour of such tires, as illustrated in Fig. 5, and in addition will be provided with straight integral inward extensions 17, which are adapted to act conjointly as a face-plate or abutment against which the end of the tire will rest when in place in the holding-jaws.

The cam-ring 16 is arranged to lit in an annular recess in the side face of the workholder, and its outer margin is flush with the side face of the holder and extends beneath or engages the inwardly-projecting lip or flange 5 of the head-stock, which latter is made of such width as to overlap said cam-ring. This construction greatly simplifies these parts, because the ring 16 is a simple fiat ring, which in assembling the parts is merely inserted in the shallow lateral recess formed in the side of the work-holder to receive it, and said ring is held in place in the work-holder after the assembling of the parts by the same flanges 5, which hold the work-holder in place in the head-stock.

18 18 are counterpart base or saddle plates of the toolcarriers, supported at opposite sides of the head-stock 2, upon the main bed 1, in any usual and well-known manner.

19 19 and 20 20 are pairs of intermediate carriages, one pair to each base or saddle plate 18,,and arranged to slide transversely thereon.

21 21 and 22 22 are pairs of upper carriages, individual to the intermediate carriages 19 20, and arranged to slidelongitudinally thereon.

23 represents the tool holders or clamps of the respective upper carriages 21 22.

With the above-described arrangement of the tool-carriers the turning or boring out of the inner portion of the tire to the required or standard dimensions can be performed simultaneously from both sides of the headstock and work-holder, and the described ar rangement of duplicate or twin tool-carriers at each side of the head-stock affords, in addition, means whereby a finishing out can be effected by one tool-carrier, while a rough cut is being effected by the companion tool-carrier.

With the present invention the complete formation of the inner surface of the tire or other like annular article can be effected with one setting of the tire in the annular Workholder.

An important feature of the boring-mill illustrated is the annular work-holder, and the radially-movable jaws mounted in the annular work-holder, combined with the camring mounted to rotate freely or to be turned entirely around on the work-holder and having a single spiral thread which extends entirely around the ring in a plurality of convolutions or turns, and which engages all of the jaws, so as to give corresponding and simultaneous radial movement to the said jaws, this construction giving a wide range of movement in the jaws and thereby permitting tires differing considerably in diameter to be automatically centered and secured in the work-holder, while at the same time enabling these results to be secured without making the head-stock and work-holder unduly large in diameter or much larger than the largest size of tire the machine is designed to receive.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A boring-mill for locomotive-tires and like annular articles comprising a main bed, a stationary annular head-stock carried thereby, an annular work-holder mounted in the head-stock and provided with peripheral gearteeth, said head-stock being provided with two annular bearing-surfaces engaging the work-holder at either side of the gear-teeth thereon and with inwardly-extending annular lips or flanges which overlap the side faces of the work-holder, a plurality of jaws which slide radially in the work-holder and which project inwardly from the inner face of the same, and a rotative cam ring which fits against the side face of the work-holder and is engaged at its outer edge with and is held in place by the inwardly-projecting lip in the head-stock, said cam-ring having on its inner face a single spiral thread which extends entirely around the ring in a plurality of turns and engages notches in the several jaws, so as to give equal and simultaneous movement thereto when the ring is turned on the workholder, and means engaging the teeth in the work-holder to turn the same in the headstock. I

2. A boring-mill for locomotive-tires and like annular articles, comprising an annular head-stock, an annular work-holder, radiallysliding jaws which slide in radial guide-re cesses in the workholder and a cam-ring which fits in an annular recess at one side of the Work-holder and which has an inner fiat face provided with a continuous spiral rib which makes a plurality of turns about the IIO ring and engages the adjacent side edges of which makes a plurality ring and engages the adjacent side edges of the jaws, said jaws being of uniform width from end to end and provided at one side thereof with integral, inwardly-projecting extensions forming abutments against which one side edge of the work rests when held in the jaws.

Signed at Chicago, Illinois, this 6th day of January, 1902.

ISAAC E. MOORAOKEN. Witnesses:

J. D. WOODS, ROBERT BURNS.

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